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PASCO PI-9880 Power Supply User Manual

Page 12

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D C P r o g r a m m a b l e P o w e r S u p p l y

12

T u t o r i a l

Display shows current Over Load

Turn the Function knob back to Constant DC
(

). Increase the voltage until the Current

LED blinks amber and the display shows
OL (for “overload”) to indicate that the max-
imum current has been exceeded and the out-
put has automatically turned off (this will
happen only if you have a load hooked to the
power supply). Press

to return the Power

Supply to normal operation.

Turn the Function knob back to SET MAX.
Press

once to display the maximum cur-

rent setting. Adjust it back to 1.05 A.

Set countdown time in hours

3.

Press

so that the Time LED starts blink-

ing and the display shows 0.00; this is the
countdown time in hours. Turn the Fine
knob to set the time for 0.01 hour (36 sec-
onds). Note that the Time LED is blinking to
indicate that the countdown has not started
yet.

Display shows auto off

Press

to start the countdown. The Time

LED is now lit steadily. Turn the Function
knob back to Constant DC (

) and set the

voltage to 1 V. Wait for the remainder of the
36 seconds. When the countdown time has
elapsed, the display shows OFF to indicate
that the output has been switched off. Press

to return the Power Supply to normal

operation.

Setting “Hidden” Global Maximum voltage

4.

Turn the Function knob back to SET MAX.
Push and hold both buttons until the Voltage
LED starts blinking fast and the display
shows 18.00 (this is the Global Maximum
voltage setting); while holding both buttons,
turn the Coarse knob to change the Global
Maximum to 14.00 V. Release both buttons.
You have just set the Power Supply so that
the output voltage, the voltage-limit setting,
and any other voltage setting cannot exceed
14 V.

5.

Repeat the previous step to turn the Global
Maximum back to 18 V.

For more information about setting maximum values,
see page 20.

Press so
the TIME

LED starts

blinking.

Press

and

hold both

buttons.